This tutorial explains installation steps for PureOS 8.0 GNU/Linux. PureOS is a fully free computer operating system based on Debian with modern desktop (GNOME 3.26) and latest software (rolling release). PureOS installation is very easy for beginners and it doesn't requires internet connection. The whole installation takes only 10 minutes and already includes all device drivers. However, while you can perform this tutorial in singleboot and dualboot modes, it's best to install PureOS in a blank computer. Read each step carefully and happy installing!

Preparations

You can only install PureOS in a 64 bit computer. Unfortunately, PureOS doesn't support 32 bit for now.

Prepare 2 blank partitions before installing. Create a bigger one (>=20GB) for main partition, and create a smaller one (>=1GB) for swap partition. I suggest you to shrink an unmounted Windows partition (if you use another OS), or, create ones from an unused partition (if you have one). You can do it with GParted program.

As example, I use my /dev/sda6 (20GB) as my main partition, and /dev/sda7 (2GB) as my swap partition.

6. Create Swap Partition

Sixth step: create a swap partition. This doesn't need to be huge (1 or 2GB is enough), doesn't need to be 2xRAM anymore, but still necessary. As example suggests, I determine my /dev/sda7 (2GB) as my swap.

7. Choose Bootloader Location

Seventh step: select the location for bootloader to be installed. Bootloader is a small program placed at Hard Disk Drive, the disk where the main partition resides. For instance, if your main partition is /dev/sda6, then your Hard Disk is /dev/sda. If your partition is /dev/sdb9, then your Hard Disk is /dev/sdb. Based on my main partition being /dev/sda6, so, I select /dev/sda as my bootloader location.

8. Determine Username/Password

Eighth step: create your own username and password. This is your own user account on PureOS. Also, your password here will be the password of sudo command later.

9. Execute

Ninth step: read carefully each of the summary and then start the actual installation. Make sure you've verified OK to all of your choices. If you press OK/Install Now here, then the actual partitioning starts, and you cannot revert back anymore.

The summary of above steps from 1st until 8th (of course, yours may have differences to mine):

Once you are sure everything is OK, go press Next and press Install Now:

10. Waiting

Tenth step: just wait. On an low-spec laptop (Aspire One 756, 4GB RAM, 120GB SSD) it takes no more than 10 minutes. If your computer is better, then it should be faster.

Finished

Once finished, it says "All done." and you can just restart to use PureOS. Happy running!